package demo3;

public class Computer {
    public void openPower() {
        System.out.println("打开电脑...");
    }

    public void closePower() {
        System.out.println("关闭电脑...");
    }

    public void IUsbService(IUsb usb) {
        usb.openDevice();
        if(usb instanceof Mouse) {
            Mouse mouse = (Mouse) usb;
            mouse.click();
        }else if(usb instanceof KeyBoard) {
            KeyBoard keyBoard = (KeyBoard) usb;
            keyBoard.input();
        }
        usb.closeDevice();
    }
}
